fix: add unique constraint on show_djs (show_id, dj_id)

shared/database/src/schema.ts

@@ -389,15 +389,19 @@ export const shows = wxyc_schema.table('shows', {
 
 export type NewShowDJ = InferInsertModel<typeof show_djs>;
 export type ShowDJ = InferSelectModel<typeof show_djs>;
-export const show_djs = wxyc_schema.table('show_djs', {
-  show_id: integer('show_id')
-    .references(() => shows.id)
-    .notNull(),
-  dj_id: varchar('dj_id', { length: 255 })
-    .references(() => user.id, { onDelete: 'cascade' })
-    .notNull(),
-  active: boolean('active').default(true),
-});
+export const show_djs = wxyc_schema.table(
+  'show_djs',
+  {
+    show_id: integer('show_id')
+      .references(() => shows.id)
+      .notNull(),
+    dj_id: varchar('dj_id', { length: 255 })
+      .references(() => user.id, { onDelete: 'cascade' })
+      .notNull(),
+    active: boolean('active').default(true),
+  },
+  (table) => [uniqueIndex('show_djs_show_id_dj_id_unique').on(table.show_id, table.dj_id)]
+);
 
 //create entry w/ ID 0 for regular shows
 export type NewSpecialtyShow = InferInsertModel<typeof specialty_shows>;

tests/unit/database/schema.show-djs.test.ts

@@ -0,0 +1,18 @@
+import { getTableConfig } from 'drizzle-orm/pg-core';
+import { show_djs } from '../../../shared/database/src/schema';
+
+describe('show_djs schema', () => {
+  it('has a unique index on (show_id, dj_id)', () => {
+    const config = getTableConfig(show_djs);
+    const uniqueIndexes = config.indexes.filter((idx) => idx.config.unique);
+
+    const showDjIndex = uniqueIndexes.find(
+      (idx) =>
+        idx.config.columns.length === 2 &&
+        idx.config.columns.some((col) => 'name' in col && col.name === 'show_id') &&
+        idx.config.columns.some((col) => 'name' in col && col.name === 'dj_id')
+    );
+
+    expect(showDjIndex).toBeDefined();
+  });
+});